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ppmdither - ordered dither for color images
ppmdither [-dim
power] [-red shades] [-green shades] [-blue shades] [ppmfile]
Reads
a portable pixmap as input, and applies dithering to it to reduce the number
of colors used down to the specified number of shades for each primary.
The default number of shades is red=5, green=9, blue=5, for a total of
225 colors. To convert the image to a binary rgb format suitable for color
printers, use -red 2 -green 2 -blue 2.
- -dim power
- The size of the dithering
matrix. The dithering matrix is a square whose dimension is a power of
2. power is that power of 2. The default is 4, for a 16 by 16 matrix.
- -red
shades
- The number of red shades to be used, including black; minimum of
2.
- -green shades
- The number of green shades to be used, including black;
minimum of 2.
- -blue shades
- The number of blue shades to be used, including
black; minimum of 2.
pnmdepth(1)
, ppmquant(1)
, ppm(5)
Copyright
(C) 1991 by Christos Zoulas.
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